Thermostatic regulator.



Um TED STATES PATENT oEEIoE.

JAMES F. MCELROY, OF ALBANY. NEW YORK. ASSIGNOR TO CONSOLIDATED CAR- HEATING COMPANY, A CORPORATION OF WEST VIRGINIA.

THERMOSTATIC REGULATOR.

Specification of Letters Patent.

Patented May 1 6, 1916.

To all whom it may concern:

Be it known that 1, JAMES F. McELRoY. a citizen of the United States, residing at Albany, county of Albany, State of New York, have invented certain new and useful Improyements in Thermostatic Regulators, the following being a full, clear, and exact disclosure of the one form of my invention which I at present deem preferable.

For a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawing, which illustrates my invention, wherein- K Figure 1 is a diagram of the electric circuits; Fig. 2 isa diagram of the circuits and apparatus.

My invention relates to a thermostatic regulator and includes an arrangement for completely removing current from all parts of the apparatus whenever the heating device controlledby the regulator is not work- Tteferring to Fig. 1, A represents the main switch magnet acting on switch lever L to open and close the main circuit (shown in heavy lines) between the trolley T and an electric heater H, the heater H being connected to ground G. The magnet A is controlled by a thermostat, the contact blade of which is indicated at 30 near the upper left hand corner of the figure. C is a retaining magnet for the blade 30 and 31, are the contacts for the blade, the upper contact 31 being engaged by the blade'to energize mag,- net A and close the heater circuit. and the lower contact 32 being engaged thereby to denergize magnet A and open the heater circuit. B is a relay magnet which. when energized, brings switch blade '26 into engagement with contacts 27 and R and R are resistances and D is a blow-out magnet for the main heater switch.

The parts are indicated in their neutral position, the main switch being open and blade 30 out of engagement with both ot the contacts 31 and Then we will assume that the cooling off of the a e.) '1 causes the blade 30 to come into contact with the point 31. That will close a temporary u cuit, which is indicated by the single 1? arrows, as follows t -From troiley '1... by v. 40 to resistance R by wire it to fusei: tor-clay B: by wire 29 to blade 30; to contact 1; to-retaining magnet C; by wire 38 to.

supplementary switch S (which serves to short circuit resistance Il by contact 42 and wire 13) to main magnet A and by wire 49 to ground G. This will manifestly energize both relay B and main magnet A. The effect of energizing relay B is to connect con tacts 27 and 28-through blade 26, thereby shunting out the thermostat, the current which traverses the circuit 1 have just traced then goin after leaving relay B, by the route indicated by the doublebarbed arrows as follows :-To contacts 28 and 27', by wires 25 and H to resistance R (the short circuit around this resistance being now broken at contact 42) thence to magnet A and by wire 49 to ground G as before. This route includes both resistances R and R The effect of energizing main magnet A is to close the heater circuit from trolley T; to contact 15 (the route through blow-out coil D, follower-contact l8 and follower-blade A? being short-circuited at said contact 45) g to switch lever L; by wire 51 to heater H and ground (1?. This energizes the heater which will continue to act until the temperature of the apartment rises sufficiently to cause the blade 30 of the thermostat to separate from contact 31.. Since the thermostat has been shunted-as aforesaid. by blade 26 and contacts '27, 28. there will be no arc between thermostat blade 30 and contact 31 when they separate. The temperature will continue to rise to a point which calls for the opening of the heater circuit. Such temperature will bring thermostat blade 30 into engagement with contact 32, which will short-circuit relay magnet B by a. route from fuse F, through wire 39. contact 32, blade 30, wire 29 and contact 28. The relay will thereupon allow blade 26 to separate from contacts 27. 28 and thereby break the aforctraced circuit through main magnet A. The dei nergizing of magnet A will allow the left end of lc\er L to drop. thereby closing switch S on contact 42 to short-circuit resistance R through wire 43. It will also allow the right end of lever L to rise, there by separating blade 4-6 from contact 45 to remove the short-circuit from blow-out coil l This immediately succeeded by the separation of the follower-blade 47 from its contact and the. final rupture thereat of the heater circuit under the blow-out action of coil D. This brings the apparatusto the condition showncin Fig. 1', in which there is no current flowing'in any part thereof, the heater being cut out.

By means of the supplementary switch S, I secure a strong actuating current in magnet A for closing the switch, while, after the switch is closed, only a small current flows in the coils of the magnet, which current is suflicient to maintain the core in its elevated position, but not suflicient to heat the coil or cause any material arc at relay contacts 26, 27 28 when the circuit is broken.

Turning to Fig. 2 which shows a diagram similar to Fig. 1. with the structure of the several parts indicated thereon, the main' switch lever L is fulcrumed at 7% on a post projecting from base 78. The left end of lac lever is connected to the core of main magnet A by ineans of an'adjustable screw- .ink 71. The magnet has a short fixed core 77 secured in a cover plate 73 on the magnetic casing which incloses the coils. The lever L carries a laminated contact 46 which cooperates with stationary contact 45, and a follower arbon-block contact 47 which cooperates with stationary contact 48. The carbon block H is detachably mounted on the end of a spring 72, being held thereon by a clip 75, which has inturned edges that engage grooves in the sides of the block, and by a spring 76 which engages the clip to force it and the carbon block against the rarrier spring 72. By this means the contacts 46, if) will separate. when the s itch opens. before the separation of contacts +7, 48 occurs, in order to break the short circuit around blow-out coil D and enable .that coil to act on any arc that may be formed between 47 and i8. on the final rupture of the heater circuit. The supplementary switch S is held down against stationary contact 4'2 by a spring so long as the main magnet is inactive. 'hen the main magnet does act, a pin 79 on lever L engages the right hand end of switch S and lifts it away from stationary contact 42.

hat I claim as new and desire to secure by Letters Patent is: w

1. The combination with a heater, of an operating magnet therefor, a relay, a circuit for said magnet. a circuit breaker in said circuit opened by the deenergizing of the relay and a therl'nostatically controlled shunt around said relay, whereby the shutting-off of the heater leaves no current in the said circuit.

2. The combination with a heater, of an operating magnet therefor. a thermostat having two contacts, one acting to close the circuit of said magnet, a relay acting to re tain said circuit closed when energized and a shunt for said relay controlled by the other of said two thermostat contacts, whereby the shutting off of said heater leaves no current in the controlling apparatus.

The combination with a heater, of an operating magnet therefor, a circuit for said magnet, a thermostat-contact for closln'g said circuit, relay contacts for maintaining by the shutting off of said heater leaves no current in the control apparatus.

4. The combination with a heater, of an operating magnet therefor, a relay magnet, a thermostat having two contacts, relay contacts controlling the circuit of said magnet, a circuit containing one of said thermostat contacts and the relay coils, a shunt circuit for said. thermostat contact controlled by the relay. and a shunt circuit for said relay controlled by the other of the two thermostat contacts.

The combination with a heater and'an operating magnet therefor, of a thermostat, a relay, relay contacts controlling the circuit of said magnet, a circuitincluding the relay and one of the thermostat contacts and a shunt. circuit for said thermostat contact controlled by the relay.

6. The combination with a heater, of an operating magnet therefor. a relay magnet, controlling said operating magnet, a thermostat, a circuit containing the coils of both of said magnets and controlled by the thermostat and a circuit shunting said thermostat and controlled by the relay.

7. The combination with a heater, of an operating magnet therefor, a relay magnet, a thermostat having two contacts. a circuit containing the coils of both of said magnets and controlled by one of said thermostatcontacts. contacts in said circuit controlled by the relay, a shunt around the said thermostat-contact controlled by the relay, and a shunt around the relay controlled by the other of the two thermostat contacts.

8. The combination with a heater, of an operating magnet therefor, a thermostat, a relay magnet. a temporary circuit including both of said magnets also a thermostat-contact. relay contacts and a resistance. a retaining circuit including both of said magnets. the relay contacts and the resistance, and a shunt circuit around said relay controlled by a second thermostat-contact.

9. The combination with an electric heater, of a circuit therefor containing a blow-out magnet and two contacts, one on each side of said magnet, a switch in said circuit having a main contact and a follower-contact adapted to engage respectively with the two contacts aforesaid, a magnet for operating the said switch, a relay for said magnet anda thermostat controlling the said relay. I

10. The combination with a heater, of an operating magnet therefor, a relay magnet, a starting circuit including the coils of both magnets in series. thermostatic means connected with said starting circuit and controlling the same. a holding circuit also including both magnets in series and shunting the thermostatic means, and contacts in said holding circuit controlled by said relay magnet. said contacts controlling said holding circuit.

11. The combination with an electric heater, of a switch in the heater circuit, an operating magnet for said switch, and a thermostatically controlled relay for said magnet having its coils contained in a circuit which also contains the coils of said op erating magnet, and in series with said operating magnet. and means for shunting the thermostat.

In witness whereof I have hereunto set my hand, before two subscribing witnesses, this 30th day of January, 1914.

JAMES F. MclJLROY.

\Vi tnesses HERBERT A. CALKIXs, J. EDWARD BINLEY. 

